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var add = function(a,b){
 return a + b;
};
var myObject = {
 value:3,
 getValue:function(){
  return this.value;
 }
};
myObject.double = function(){
 var that = this;
 var helper = function (){
  //add·½·¨ÄÚµØthisÖ¸Ïòwindow¶ÔÏó£¬Ó¦¸ÃËãÊÇjavascriptÉè¼Æ´íÎó
  //ËùÒÔÕâÀïÓÃÒ»¸ö¾Ö²¿±äÁ¿Ö¸ÏòÄÚ²¿·½·¨²ÎÊý
  that.value = add(that.value,that.value);
 };
 helper();
};
myObject.double();
document.writeln(myObject.getValue());


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function setCookie(name,value)
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  var Days = 1; //´Ë cookie ½«±»±£´æ 1 Ìì
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